524355domain: NAppears in sequencesa(n) = 2^n + prime(n).at n=18A265160a(n) = Sum_{d|n} prime(n/d)^d.at n=18A309368The sum of 2^((d-1)/2) over all divisors of 2n+1.at n=19A339916Expansion of Sum_{k>0} x^k / (1 - 2*x^(2*k)).at n=38A364034